Safety pressure-valve device



Feb. 8,1927. 75

. 'H. s. WILLIAMS SAFETY PRESSURE VALVE DEVICE Y Filed May 5, 1924 V v an mm;

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Patented Feb. 8,1927. I

' HARVEY s. WILLIAMs, or znienvn, TEXAS,

' SAFETY rnnssnnmvnnvn-nnvlon. i

'App1ication filed May 3,

' This invention relates tonew and useful improvements in safety pressure 'valve. devices. I The object of the invention is to provide a valve device arranged to permit a flow of fluid'under a normal pressure, but automatically; cutting off the flow under anexcessive pressure or increased velocity.

Anotherobject is to provide a safety. device having a relatively-stationary valve and a resiliently sustained piston carrying a. seat for the valve, normally spaced therefrom,

with relation to its seat. I

A further object is to provide a stationary deflector at the entrance of the device to receive the initial impact of the inflowing fluid and spread the same, whereby the piston is shouldered and caused to remain in its normal position.

A. construction designed together with means for adjusting the valve to carry out the invention will be hereinafter described together with other features of the invention.

The invention will be more readily understood from a reading of thefollowing specification and by reference'to the accompanying drawings, in which an example of the I or other receptacle A from whichvit is denormally supports sired to control the flow of fluid. The upper portion of the cup is flared at an angle to the perpendicular.

An internal annular stop flange 13 is proend of the cylinder and vided at the lower a tubular piston 14 mounted to slide vertically in the cylinder. The piston has an axial bore or passage 15 at the lower end of which is formed a valve seat 16. At the upper end of the cylinder is mounted a cross bar 17 and below this bar is mounted a second cross bar '18, spaced therefrom. A coiled spring 19 having its upper end confined by the vcross bar 18 rests upon the piston 14 and holds the latter on the flange 13. The piston is thus held under spring tension.

a 15, just above 1924-. Serial at. 710,887.

i A valvev stein bars l7 ,and18 by. means of nuts'21 and 22,,

[whereby itis vertically adjustable. Ayalve,

23 i fastened on the stem within the bore .tionary and is 20 isimmovably held inthe,

,60 theseat16. .Thevalve i's-sta- .engagedby the seat when the piston is displacedupwardly. By vertically i adjusting'the stem 20, the .distancethe piston;

must travel before seating, the valve, is con} trolled. The tension ofSthe spring-'19 gov .erns .the pressure which must be exerted to lift the piston.

An inverted conical deflector 24is mount r ed on thelower end of the stein 20 within the "cup 11, immediately below the piston 14. The sides of this deflector conformgem erally to the sides of the cup and the upper end of the deflector has a diameter greater than that of the seat 16. The top .of the deflector is dished and the bottom of the piston is bevelled to conform thereto.

In operation the fluid under pressure such assteam, enters the stem 12 and encounters the deflector 24 which takes the initial impact and spreads the fluid. The fluid passes up the sides of the deflector and then impinges the bottom of the piston. The tension of the spring 19 is suflicient to, resist the pressure of thefluid and it finds its way between the piston and the dished top of the deflector to the bore 15, after passing through the seat 16. From the bo-re15 the fluid passes into the cylinder from which it is suitably conducted as desired. I I

Should an excess of fluid-under an abnormal creased velocity, enter the cup, it will impinge the piston and overcome the tension of the spring 19, thus forcing the piston up- I wardly. When the piston is moved upwards ly the seat 16 will be engaged with the valve 23, whereby the bore 15 will be closed. This will automatically cut- 05 the flow'of fluid. The device isespecially useful with locoboilers to out off an excessive flow motive of steam, bu't t may be used in numerous other places.

Various changes in the" size and shape of the various parts, as well as modifications and alterations may be made within the scope of the appended claims.

What I claim, is:

1. In, a safety pressure valve device, a cylinder having an interior stop at one spring tensioned piston inthe cylinder norend, a

pressure or flowing with an in mally held in engagement with said stop and having a fluid passage and valve seat cylinder and bearing on the piston to maintherein, a stationary valve positioned relatain it in contact with said stop.

tive to the stop to maintain a fixed opening 3. In a safety pressure valve device, a cyland to be engaged by the seat when the inder, a stop within the same and at the J piston is displaced firom the stop, and alower end thereof, a piston slidable within stationary deflector inadvance of the piston said cylinder and normally engaging said stop and overlapping the opening to the seat, spring means maintaining said piston valve seat. I upon said stop, said piston having an axial 2. In a safety pressure valve device, a bore extending entirely through the same,

a cup having a depending stem, a cylinder a valve seat within said bore,'a stem fixed mounted in the cup, a piston movable in within said cylinder and-extending through the cylinder and having a normally" open said bore, a valve head affixed to said stem axial bore and a valve seat, a valve stem staand disposed relative to the piston stop to tionary in the cylinder and passing through maintain afiXed opening at saidbore seat, the bore and seat of the piston, a valve and a deflector secured to said stem at the mounted on the stem adjacent the seat of low-er end thereof and spaced at a fixed disthe piston, a stop within the cylinder spaced tance from the adjacent end of said piston to'provide a fixed opening at the valve when when spring seated.

engaged by the'cylinder, an inverted conical In testimony whereof I afiixmy signadefiector stationary on the stem below the ture.

piston, and a coiled'spring confined in the y HARVEY S. WILLIAMS 

